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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/82 = 4/x // - 4/x
1/82-(4/x) = 0
1/82-4*x^-1 = 0
-4*x^-1 = -1/82 // : -4
x^-1 = 1/328
-1 < 0
1/(x^1) = 1/328 // * x^1
1 = 1/328*x^1 // : 1/328
328 = x^1
x = 328
x = 328
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